SIM300D EVB User Guide
SIM300D-EVB_UGD_V1.01 Page 9 of 19
3.2 Audio Interface
Figure
5:
Audio
Interface
Headset interface:
Pin
Signal
I/O
Description
1
MIC1P
I
Positive microphone input
2
SPK1P
O
Positive receiver output
3
SPK1N
O
Negative receiver output
4
MIC1N
I
Negative microphone input
Earphone interface:
Pin
Signal
Input/Output
Description
5 MIC2P&SPK2P I/O
Auxiliary positive input and output
